package com.atguigu.gulimall.product.service.impl;

import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        List<CategoryEntity> categoryList = baseMapper.selectList(null);
        //查找所有一级分类
//        List<CategoryEntity> level1Munus =new ArrayList<>();
//        for (CategoryEntity categoryEntity : categoryList) {
//            if(categoryEntity.getParentCid() == 0){
//                level1Munus.add(categoryEntity);
//            }
//        }
        List<CategoryEntity> level1Munus = categoryList.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == 0;
        }).map(menu ->{
            menu.setChildren(getChildren(menu,categoryList));
            return menu;
        }).sorted((menu1,menu2) ->{
            return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());

        for (CategoryEntity level1Munu : level1Munus) {
            List<CategoryEntity> children = getChildren(level1Munu, categoryList);
            level1Munu.setChildren(children);
        }
        return level1Munus;
    }

    //[225,70,12]
    @Override
    public Long[] getCatelogPath(Long catelogId) {
        CategoryEntity byId = this.getById(catelogId);
        ArrayList<Long> list = new ArrayList<>();
        list.add(catelogId);
        while (byId.getParentCid()!=0){
            byId = this.getById(byId.getParentCid());
            list.add(byId.getCatId());
        }
      //  List<Long> parentPath = getParentPath(byId.getParentCid(), list);
        Collections.reverse(list);
        return list.toArray(new Long[list.size()]);
    }
    private List<Long> getParentPath(Long catelogId,ArrayList<Long> list){
        list.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if(byId.getParentCid()!=0){
            getParentPath(byId.getParentCid(),list);
        }
        return list;
    }

    public List<CategoryEntity> getChildren(CategoryEntity root,List<CategoryEntity> all){
          List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
              return categoryEntity.getParentCid() == root.getCatId();
              //map()中就是制定集合中元素要如何操作
          }).map(categoryEntity -> {
              categoryEntity.setChildren(getChildren(categoryEntity,all));
              return categoryEntity;
          }).sorted((menu1,menu2) ->{
             return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
          }).collect(Collectors.toList());
            return children;
      }

//    public List<CategoryEntity> getChildren(CategoryEntity root,List<CategoryEntity> categoryList){
//        List<CategoryEntity> children =new ArrayList<>();
//        for (CategoryEntity categoryEntity : categoryList) {
//            if(categoryEntity.getParentCid()== root.getCatId()) {
//                children.add(categoryEntity);
//            }
//        }
//        root.setChildren(children);
//        for (CategoryEntity child : children) {
//            child.setChildren(getChildren(child, categoryList));
//        }
//        return children;
//    }

}